Development Milestones

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Development Milestones

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Early Adolescence Age 11-13
  • Increase vocabulary to 40,000 words (nearly double from ages 8-9)
  • Choose friends based on common interests, rather than parent selection
  • Begin the process of sexual maturation, both physically and emotionally
  • Become more interested in community goals — service to others


Middle Adolescence Age 14 to 16
  • Increase their hypothetical reasoning abilities
  • Conduct increasing future planning
  • Experience further sexual maturation and explore issues of sexual identity
  • Exhibit greater complexity of moral reasoning, including abstract principles such as unselfishness and altruism
  • Tend to rely increasingly on similarity of values and shared interests to form friendships
  • Spend majority of time with friends, less time with parents
  • Refine interests and aptitudes, gain proficiency in one or more activities